// Ninf-G-XX, ver. 0.1
// Copyright 2011 National Institute of Advanced Industrial Science and Technology
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef __NC_EXPRESSION_H__
#define __NC_EXPRESSION_H__

#include "ExpEntry.hpp"
#include "DataOutputStream.hpp"
#include "DataInputStream.hpp"

namespace ninf {
namespace gen {

class Expression {
public: 
  int                    nEntries;
	ninf::gen::ExpEntry *  entries;

  // CONSTRUCTORS
  Expression (ninf::lib::DataInputStream & dis);  // throws Exception if failed 
  Expression (int nEntries, ninf::gen::ExpEntry * entries):
    nEntries(nEntries), entries(entries){}

  static 
    Expression none(){
    return Expression(0, NULL);
  }

  // METHODS

  // write 
  void writeTo(ninf::lib::DataOutputStream & dos);

  // write out declaration string 
  void writeDeclaration(int tab, const char * id, 
			int index0, int index1, int index2, FILE * fp);

  // evaluate the expression
  int  evaluate(int * iArgs, int len, int defaultValue);
};
}
}
#endif 
